On Wed, Sep 20, 2006 at 03:07:46PM +0100, Ben Wylie wrote:
> MIME-Version: 1.0
> Content-Type: multipart/related;
>       type="multipart/alternative";
>       boundary="----=_NextPart_000_0005_01C6DC77.1B7CF1F0"
> 
> But then the first mime part is empty and changes the mime boundary:
> 
> ------=_NextPart_000_0005_01C6DC77.1B7CF1F0
> Content-Type: multipart/alternative;
>       boundary="----=_NextPart_001_0006_01C6DC77.1B7CF1F0"

It's not empty, it's a multipart that contains 2 parts.

> They then have two mime parts with this new mime boundary, first a text 
> and then an html mime part:

Yep, that's multipart/alternate.

> They then revert back to the original mime boundary for the image spam 
> mime part:

Yep, the image isn't an alternate for the text parts.

> Does this happen in legitimate emails as well?

Absolutely.

> I have never seen this in a legit email, however i do spend far longer 
> looking at spam then i do ham.

You have never seen MIME encoded ham?

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